drm/i915/audio: Use intel_de_rmw() for most audio registers

The audio code does a lot of RMW accesses. Utilize
intel_de_rmw() to make that a bit less tedious.

There are still some hand rolled RMW left, but those have
a lot of code in between the read and write to calculate
the new value, so would need some refactoring first.

v2: Add parens around the ?: to satisfy the robot

Cc: Chaitanya Kumar Borah <[email protected]>
Cc: Kai Vehmanen <[email protected]>
Cc: Takashi Iwai <[email protected]>
Reviewed-by: Jani Nikula <[email protected]>
Reviewed-by: Kai Vehmanen <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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